诚信 is one of the core values in both Confucian tradition and modern Chinese society. China's social credit system is formally called 社会信用体系, reflecting how seriously 信 (trust/credit) is taken.
usage
讲诚信 means 'to value/practice integrity'. 诚信 is more formal and abstract than 诚实 (chéngshí, honest), which describes a personal quality.
